对于SDK 3.2 或更高版本，我们可以使用FBWebDialogs类来帮助我们显示一个弹出窗口以及好友列表，并从列表中选择一个或多个来发送邀请。
让我们一步一步来：
1) 下载并安装 SDK 3.2或更高版本。
2) 首先按照这个url 在 facebook 上设置你的应用程序。
3）然后使用随附的代码。
示例代码：（生成邀请好友请求）
-(void)inviteFriends
{
if ([[FBSession activeSession] isOpen])
{
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:nil];
[FBWebDialogs presentRequestsDialogModallyWithSession:nil
message:[self getInviteFriendMessage]
title:nil
parameters:params
handler:^(FBWebDialogResult result, NSURL *resultURL, NSError *error)
{
if (error)
{
[self requestFailedWithError:error];
}
else
{
if (result == FBWebDialogResultDialogNotCompleted)
{
[self requestFailedWithError:nil];
}
else if([[resultURL description] hasPrefix:@"fbconnect://success?request="])
{
// Facebook returns FBWebDialogResultDialogCompleted even user
// presses "Cancel" button, so we differentiate it on the basis of
// url value, since it returns "Request" when we ACTUALLY
// completes Dialog
[self requestSucceeded];
}
else
{
// User Cancelled the dialog
[self requestFailedWithError:nil];
}
}
}
];
}
else
{
/*
* open a new session with publish permission
*/
[FBSession openActiveSessionWithPublishPermissions:[NSArray arrayWithObject:@"publish_stream"]
defaultAudience:FBSessionDefaultAudienceFriends
allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState status, NSError *error)
{
if (!error && status == FBSessionStateOpen)
{
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:nil];
[FBWebDialogs presentRequestsDialogModallyWithSession:nil
message:[self getInviteFriendMessage]
title:nil
parameters:params
handler:^(FBWebDialogResult result, NSURL *resultURL, NSError *error)
{
if (error)
{
[self requestFailedWithError:error];
}
else
{
if (result == FBWebDialogResultDialogNotCompleted)
{
[self requestFailedWithError:nil];
}
else if([[resultURL description] hasPrefix:@"fbconnect://success?request="])
{
// Facebook returns FBWebDialogResultDialogCompleted even user
// presses "Cancel" button, so we differentiate it on the basis of
// url value, since it returns "Request" when we ACTUALLY
// completes Dialog
[self requestSucceeded];
}
else
{
// User Cancelled the dialog
[self requestFailedWithError:nil];
}
}
}];
}
else
{
[self requestFailedWithError:error];
}
}];
}
}
这里是调用委托函数OnFBSuccess和的辅助函数OnFBFailed。
- (void)requestSucceeded
{
NSLog(@"requestSucceeded");
id owner = [fbDelegate class];
SEL selector = NSSelectorFromString(@"OnFBSuccess");
NSMethodSignature *sig = [owner instanceMethodSignatureForSelector:selector];
_callback = [NSInvocation invocationWithMethodSignature:sig];
[_callback setTarget:owner];
[_callback setSelector:selector];
[_callback retain];
[_callback invokeWithTarget:fbDelegate];
}
- (void)requestFailedWithError:(NSError *)error
{
NSLog(@"requestFailed");
id owner = [fbDelegate class];
SEL selector = NSSelectorFromString(@"OnFBFailed:");
NSMethodSignature *sig = [owner instanceMethodSignatureForSelector:selector];
_callback = [NSInvocation invocationWithMethodSignature:sig];
[_callback setTarget:owner];
[_callback setSelector:selector];
[_callback setArgument:&error atIndex:2];
[_callback retain];
[_callback invokeWithTarget:fbDelegate];
}
所以调用方法的类InviteFriend必须具有以下功能：
-(void)OnFBSuccess
{
CCLOG(@"successful");
// do stuff here
[login release];
}
-(void)OnFBFailed:(NSError *)error
{
if(error == nil)
CCLOG(@"user cancelled");
else
CCLOG(@"failed");
// do stuff here
[login release];
}
推荐阅读：
通过 Facebook 发送邀请
API 权限
一个例子
笔记：
1) 不要忘记在plist.
2）不要忘记调整AppDelegate以处理 urls。
部分摘录自第 2 点中的上述链接：
/*
* If we have a valid session at the time of openURL call, we handle
* Facebook transitions by passing the url argument to handleOpenURL
*/
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
// attempt to extract a token from the url
return [FBSession.activeSession handleOpenURL:url];
}
希望能帮助到你！
编辑
这里：
fbDelegate 的声明是：
@property (nonatomic, assign) id <FBLoginDelegate> fbDelegate;
@protocol FBLoginDelegate <NSObject>
@required
-(void) OnFBSuccess;
-(void) OnFBFailed : (NSError *)error;
@end
这就是您可以使用此代码的方式：
FBLoginHandler *login = [[FBLoginHandler alloc] initWithDelegate:self]; // here 'self' is the fbDelegate you have asked about
[login inviteFriends];